Originally Posted by infectcode
Is there a tutorial on how to downgrade? Once I downgrade I can use nuts method?
yeah. just flash an older rootable firmware(10.3.A.0.423) using flashtool. root it using doomlord's rooting kit. take a backup of TA partition using devshaft's backup-ta kit. this back up of TA is just to relock your bootloader whenever you unlock it because unlocking BL voids warranty. but the backup of TA partition must be taken in locked BL condition. flash nut's dual recovery. now follow the steps in the link posted above and upgrade to 4.4.2. this method doesn't need your BL to be unlocked.
there is another easy method which requires unlocking BL. but you can relock it as if you never unlocked. i prefer this method. the link is posted below.